Grinding-machine.



c. M. 'STRETCHER.

GRINDING MACHINE. APPLICATION FlLED AUG-23,1915.

Patented Apr. 4, 1916.

Emma I Oarl Stretcher,

CARL M. STBETCHER, OF

SPRINGFIELD, OHIO, ASSIGNOR OF ONE-HALF TO CHARLES H.

STEPHAN, OF SPRINGFIELD, OHIO.

GRINDING-MACHINE.

To all whom it may concern:

Be it known that I, CARL M. Srnnronnn, a citizen of the United States,residing at Springfield, in the county of Clark and State of and usefulImprovements in Grinding-Machines, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to grinding machines and more particularly to anelectrically driven center grinder for lathes and the like.

The object of the invention is to provide a compact self-containedelectrical grinder which can be readily placed in position to grind thecenter of a lathe, or other part which is to be ground, and adjusted tobring the grinding wheel in proper relation to the part to be ground.

A further object of the invention is to provide a grinding machine ofthis kind in which the grinding wheel can be manipulated independentlyof the motor parts to cause it to travel over the work; and further, toprovide a grinding machine of this kind which will be simple in itsconstruction and operation and inexpensive to produce.

The accompanying drawing is a plan view, partly in section, of agrinding machine embodying my invention, showing the same applied to alathe.

In this drawing I have illustrated one embodiment of the invention andhave shown the same as mounted on the tool post of an ordinary lathe andarranged to grind the center of that lathe. It will be understood,however, that this is chosen for the purpose of illustration only andthat the invention can be embodied in various forms and used for variouspurposes.

As here shown, the invention comprises a motor which consists of a frameor casing 1. having at its ends bearings 2 and 3 in which is journaledan armature shaft 4. Carried by this armature shaft and rotatingtherewith is a grinding wheel 5. In order that this grinding wheel maybe caused. to travel over the work as the grinding is accomplished it ismounted for longitudinal movement relatively to the motor shaft andindependently thereof, whereby it is possible to mount the motor in afixed position and manipulate only the grinding Specification of LettersPatent.

Application filed August as, 1915. Serial No. 46,821.

Ohio, have invented certain new Patented Apr 1916.

wheel during the grinding: "operation. In the present arrangement thearmature shaft is made hollow and the grinding wheel shaft, which isshown at. 6, is mounted in this hollow armature shaft for longitudinalsliding movement but is held against rotary movement relatively thereto.This may be accomplished in different ways but I have here shown theshaft 6 as having a longi tudinal groove 7 to receive a key or spline 8carried by the armature shaft 4. Preferably, the groove is formed inthat end of the shaft 6 opposite the grinding wheel 5 and extends to theend of the shaft. By this arrangement the grinding wheel and its shaftcan be removed from the motor without interfering with the armatureshaft and the key 8 can be placed near one end of the armature shaftwhere it is readily accessible. Suitable means are"'provided forimparting axial movement to the grinding wheel and in that form of thedevice here shown I have secured to the shaft 6 a collar 9 having aflange 10 which projects between the'arms of a yoke 11 formed on one endof an operating lever 12, the opposite end of which constitutes ahandle, as shown at 13. This lever 12 is mounted between its ends on abracket 1 1 which is preferably mounted on the motor frame or casing 1,as in this manner the device can be retained in its completely assembledcondition while it is being moved from one position to another and theoperating handle will be maintained always in proper relation to theshaft 6. The yoke 11 is preferably provided with two contact points 15arranged on opposite sides of the flange 10 and tapered to permit theyoke to extend at different angles to the plane of the flange 10,thereby enabling the contact points of the yoke to be arranged close tothe flange so that there will be little or no,

wheel may be regulated. Further, by placing the collar close to theadjacent endof the armature shaft thegrincling wheel and its shaft areheld against axial movement and the wheel will rotate in a fiigedplane.

' the Work may be tion, What I claim The device may be mounted in anysuitable manner and when the device is designed for the grinding oflathe centersI prefer to mount it in the tool post of a lathe. In thepresent drawing the device is shown so mounted with the grinding wheelarranged in position to grind the center. 16 of a lathe, which latter isof a well known construction. The motor frame or casing l is providedwith an arm 17 which is rigidly secured thereto and is adapted to extendthrough and be secured in a tool post 18 of the usual construction. Byadjusting the arm 17' in the tool post the grinding mechanism may bemoved toward O-r away from the tool post and by adjusting the tool postin the usual .manner, either about its vertical axis or along thesupporting frame, the position of the grinding mechanism may be furtheradjusted with respect to the work.

The operation of the device will bereadily understood from the foregoingdescription and it will be apparent that the device is self containedand may be quickly and easily moved as a whole from one point to anotherand that it can be placed in position upon a lathe frame or othersuitable support by the mere insertion of the supporting arm into thetool post; and that the various adjustments necessary to bring thegrinding wheel into proper relation to quickly and easily accomplishedby the ordinary tool post adjustments. It will be further apparent thatthe construction is such that the device as a whole can be built at avery low cost and that the up-keep will be very low.

While I have shownand described one embodiment of my invention it willbe understood that this has been chosen for the purposes of illustrationonly and that I do not desire to be limited to the details ofconstruction shown and described, for obvious modifications will occurto a person skilled in the art.

Having thus fully described my invenas new and desire to secure byLetters Patent, is

1. In a motor, a casing having bearings a grinding wheel shaft rotatablyjournaled and longitudinally movable in said 'bearings, a grinding wheelmounted on one end of said shaft, a flanged collar mounted on the otherend of said shaft, said grinding wheel and flanged collar in connectionwith said casing acting as stops to limit the longitudinal movement ofsaid shaft, and means in engagement with said flanged collar to movesaid shaftlongitudinally.

2. In a motor, a'casing having bearings, a grinding wheel shaftrotatably journaled and longitudinally movable in said bearings, agrinding wheel mounted on one end of said shaft, a flanged collarmounted on the opposite end of said shaft, said collar said bracket,said lever having a forked end in engagement with said flanged collar,whereby the'shaft is adjusted longitudinally. 4. In a motor, a casinghaving bearings, a shaft rotatably mounted in said bearings and movablelongitudinally thereof, a grinding wheel mounted on said shaft, meanscomprising a lever pivoted to said casing for actuating the shaft toimpart longitudinal movement thereto, said means also comprising meansto limit the longitudinal movement of said shaft. -5. In a deviceof thecharacter described, a motor comprising a hollow armature shaft,

a shaft mounted in said armature shaft for longitudinal movement andheld against rotary movement relatively to said armaturev shaft, agrinding wheel carried by said last-mentioned shaft, means for actuatingsaid last-mentioned. shaft to impart axial movement to said grindingwheel relatively to said armature shaft, and adjustable means mountedonv said second shaft to limit the longitudinal movement of saidgrinding wheel shaft.

In a motor, a casing having bearings,

a shaft rotatably mounted in said bearings and movable longitudinallythereof, a grinding wheel mounted on said shaft, means adjustablymounted on said limit the longitudinal movement thereof, and means inengagement with said adjustable means to impart longitudinal movement tosaid shaft.

7. In a device of the character described, a motorcomprising a framehaving bearings, a hollow armature shaft journaled in said bearings, agrinding wheel shaft mounted in said hollow armature shaft forlongitudinal movement relatively thereto and ings, a hollow armatureshaft journaled in said bearings, a grinding wheel shaft mounted in saidhollow armature shaft for longitudinal movement relatively thereto andheld against rotary movement relatively shaft to thereto, a grindingwheel carried by said grinding wheel shaft, an actuating device mountedon said motor frame to impart longitudinal movement to said grindingwheel shaft, and an adjustable connection between said actuating deviceand said grinding wheel shaft.

9. in a device of the character described, a motor comprising aframehaving bearings, a hollow armature shaft journaled in said bearings, agrinding wheel shaft mounted in said hollow armature shaft forlongitudinal movement relatively thereto and held against rotarymovement relatively thereto, a grinding wheel carried by said grindingwheel shaft, a bracket mounted on said motor frame; a lever pivotallymounted on said bracket and having a yoke at one end thereof, and aflanged collar mounted on said CARL M. STRETGHER.

Witnesses M. RAY \VEIKART, C. H. STEPHAN.

